Opinions:

1. Yes
2. Consider classifying on WV as: Vergütungs-/ Ausgleichszins
3. Yes, but it might also be possible to attach a Depotkonto listing to save work
4. It would seem that the "free crypto" could be dividends with a value and should be classified as such. However, if they are similar to a stock dividends, where more stock is simply issued on the same capital, then possibly under WV Krypto. More information would be needed and additional research should then be done.
5. A difference between category 2 and 4 income on STE is that 2 self-employed income is subject to AHV while 4 income from securities is not.